Our Planet: Frozen Worlds

2. The process where snow builds up and compresses into ice over long periods.
4. The layer of permanently frozen ground in the Arctic.
6. A key adaptation of many polar animals for staying warm.
8. A powerful predator of seals in the Antarctic.
12. The opposite of melting.
13. A vast, thick sheet of ice that covers a large land area.
15. The movement of animals from one region to another, often in search of food or warmer temperatures.
16. The primary color of the thick fur of an Arctic fox in winter.
18. Large pieces of ice that break off from glaciers and float in the ocean.
19. The scientific study of ice and glaciers.

1. A period of inactivity some animals enter to conserve energy during harsh winters.
3. A group of related animals, like reindeer or caribou, that often migrate in large numbers.
5. The type of biome characterized by low temperatures and limited vegetation.
7. Structures built by some animals, like emperor penguins, to protect their eggs from the cold.
9. The landmass at the northernmost part of the Earth.
10. A type of evergreen tree that can withstand cold climates.
11. The gradual increase in Earth's average temperature, impacting frozen regions.
14. A flightless bird uniquely adapted to the icy conditions of Antarctica.
17. Small, shrimp-like creatures abundant in polar waters and a vital food source.
20. A seabird known for its ability to "fly" underwater in cold oceans.